T78.2 — Anaphylactic shock, unspecified
Is T78.2 billable?
No — T78.2 is a non-billable header code. T78.2 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 3 billable codes beneath T78.2.
T78.2 at a glance
| Code | T78.2 |
|---|---|
| Description | Anaphylactic shock, unspecified |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is T78.2 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to T78.2. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Allergy, allergic › anaphylactic reaction or shock (reaction) (to)
- Allergy, allergic › shock (reaction) (to)
- Shock › anaphylactic
Excludes1 — never code together
The conditions below can never be reported together with T78.2 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Inclusion terms
Alternative wording in documentation that is classified to T78.2.
- Allergic shock
- Anaphylactic reaction
- Anaphylaxis
Use additional code — inherited from Chapter 19
Report an additional code alongside T78.2 to fully describe the condition. T78.2 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T78.2, but a patient may have both at the same time. When documentation supports it, T78.2 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T78
The conditions below are not part of T78.2, but a patient may have both at the same time. When documentation supports it, T78.2 and the excluded code may both be reported.
- complications of surgical and medical care NEC (T80-T88)
Code also — inherited from T66-T78
Two codes may be needed to describe the condition fully. Whether T78.2 is sequenced first depends on the reason for the encounter.
- , if applicable, place of occurrence, such as:
- highway rest stop (Y92.523)
- school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
- service areas as the place of occurrence of the external cause (Y92.52-)
- single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
- transport vehicle as the place of occurrence of the external cause (Y92.81-)
What codes fall under T78.2? (3)
How long has T78.2 existed?
T78.2 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with T78.2?
ICD-10-CM declares these codes mutually exclusive with T78.2 — exactly one of each pair can be correct for a given encounter.
- vs R57Shock, not elsewhere classified
- vs T79.4Traumatic shock
- vs T80Complications following infusion, transfusion and therapeutic injection
- vs T80.5Anaphylactic reaction due to serum
- vs T81.1Postprocedural shock
- vs T88.6Anaphylactic reaction due to adverse effect of correct drug or medicament properly administered